How Many Carbs Are In A Small Banana?

A small banana that measures about 6 to 7 inches long contains roughly 23 grams of total carbohydrates. Of those 23 grams, about 2.6 grams come from dietary fiber, and about 12 grams are naturally occurring sugars. This makes a small banana a convenient source of quick energy, but it is not a low-carb food.

What Counts as a Small Banana?

Banana sizes are standardized by the U.S. Department of Agriculture based on length. A small banana is one that measures between 6 and 7 inches long. A medium banana is 7 to 8 inches, and a large banana is 8 to 9 inches.

Length matters more than you might think. The difference between a small and a medium banana is about 4 grams of carbohydrates. That may not sound like much, but it can matter for people tracking carbs closely, such as those managing diabetes or following a ketogenic diet.

How Many Carbs Are In a Small Banana?

A small banana (6 to 7 inches) contains approximately 23 grams of total carbohydrates. This number comes from the USDA FoodData Central database, which is the standard reference used by nutrition professionals in the United States.

Here is the full nutritional breakdown for one small banana:

• Total carbohydrates: 23 grams
• Dietary fiber: 2.6 grams
• Sugars: 12 grams
• Net carbs: about 20 grams
• Calories: 90
• Protein: 1.1 grams
• Fat: 0.3 grams

Net carbs are calculated by subtracting fiber from total carbohydrates. Fiber is not digested like other carbs, so many people tracking carbs for blood sugar control or ketosis use the net carb number. For a small banana, that comes to roughly 20 grams.

How Banana Ripeness Changes the Carb Count

The total carbohydrate number stays roughly the same as a banana ripens. The type of carbohydrate changes, and that matters for your body.

A green banana contains more resistant starch, which functions like fiber. It passes through the small intestine undigested and feeds gut bacteria. As the banana ripens, resistant starch converts into simple sugars — mainly glucose, fructose, and sucrose.

This means a ripe banana with brown spots will raise blood sugar faster than a green banana of the same size. The total carb count is nearly identical, but the effect on blood glucose is different. People with diabetes often notice this difference and may prefer less ripe bananas to slow the blood sugar response.

Small Banana vs. Other Fruits

Bananas are higher in carbohydrates than most other fruits. This is not a reason to avoid them, but it is useful context if you are comparing options.

Berries are the lowest-carb fruit option. Bananas and apples sit in a similar range. If you are comparing fruits strictly by carbohydrate content, bananas are not the lowest choice, but they offer potassium, vitamin B6, and vitamin C.

Who Should Pay Attention to Banana Carbs?

Most healthy adults do not need to worry about the carbs in a banana. The Dietary Guidelines for Americans recommend 45 to 65 percent of daily calories come from carbohydrates. For a 2,000-calorie diet, that is 225 to 325 grams per day. One small banana fits comfortably within that range.

People who may need to track banana carbs more carefully include:

• People with diabetes who count carbohydrates to match insulin doses
• People following a ketogenic diet, where daily carbs are often limited to 20 to 50 grams
• Athletes who time carbohydrate intake around training sessions
• People following a low-carb diet for weight management

For someone on a strict keto diet, a small banana would use up most or all of the daily carb allowance. For everyone else, it is a reasonable fruit choice with genuine nutritional value.

Do Bananas Spike Blood Sugar?

Bananas have a glycemic index (GI) of about 51 for a ripe banana, which is considered low to moderate. The glycemic index measures how quickly a food raises blood sugar compared to pure glucose.

However, the glycemic load — which accounts for portion size — is more useful. A small banana has a glycemic load of about 11, which is moderate. This means it will raise blood sugar, but not as dramatically as a serving of white bread or a sugary drink.

Pairing a banana with a source of protein or fat, such as peanut butter or Greek yogurt, slows digestion and blunts the blood sugar rise. This is a practical strategy for people who want to eat bananas but manage glucose response.

Are Bananas Healthy Despite the Carbs?

Yes. The carbohydrate content of a banana does not cancel out its nutritional benefits. A small banana provides about 9 percent of the daily value for potassium, which supports blood pressure regulation and muscle function.

Bananas also contain pectin, a type of soluble fiber that may help with digestion and feelings of fullness. They are one of the few fruits that provide a meaningful amount of vitamin B6 — a small banana delivers about 20 percent of the daily value.

The concern about banana carbs is mostly relevant for specific medical conditions or dietary approaches. For the general population, the World Health Organization recommends at least 400 grams of fruits and vegetables per day. A banana is a practical, inexpensive, and portable way to contribute to that target.

Can You Eat a Banana on a Low-Carb Diet?

It depends on how low you are going. On a standard low-carb diet of 100 to 150 grams per day, a small banana fits without issue. On a stricter plan of 50 grams or fewer, it likely does not.

If you want the banana flavor with fewer carbs, there is no true substitute. Green bananas have slightly fewer digestible carbs because of resistant starch, but the difference is small. No clinical evidence supports the idea that any banana variety is low-carb.

Some people choose to eat half a banana to reduce the carb load. This is a reasonable approach, but it is a portion decision, not a nutritional change. Half a small banana provides roughly 11 to 12 grams of total carbohydrates.